firefighters say black ice caused two dozen cars to pile up just outside of new york city. at least 44 people were taken to the hospital. here in the washington, d.c. metro area, the storm has become mostly rain, but if it gets any colder, freezing rain could start falling, and that would make for more treacherous driving conditions. the storm is part of a system pummeling much of the nation. it canceled more than 2400 flights sunday, and is causing more delays and cancelations for monday morning travelers. new york, boston, and big cities farther north are preparing for bad weather that could disrupt the morning commute. >>> the harsh weather is also causing shipping delays smack in the middle of the holiday shopping season. the dangerous driving conditions prompted wal-mart to send goods out to stores ahead of the storm. amazon and fedex are notifying customers that packages may arrive a day late. >>> the deputy who shot a 13- year-old boy in san -- santa rosa is back at work today. gilhaus shot andy rosa after he mistook the boy's toy gun for a real one. >>> the 21-year-